mm/huge_memory: initialise workingset state before folio split

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Summary

CVECVE-2026-80729
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-03 13:06:11 UTC
Updated2026-09-03 13:06:11 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mm/huge_memory: initialise workingset state before folio split xas_try_split() adds __GFP_ACCOUNT for page-cache xa_nodes, but __folio_split() leaves the xa_state's xa_lru unset. That lets a live, memcg-charged xa_node exist without being linked into the mapping's shadow_nodes list_lru; when reclaim later walks the list_lru it trips VM_WARN_ON(!css_is_dying()). Use mapping_set_update() to install both the workingset update callback and the shadow_nodes list_lru on the xa_state.

Risk And Classification

EPSS: 0.001890000 probability, percentile 0.086080000 (date 2026-09-07)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 58729c04cf1092b87aeef0bf0998c9e2e4771133 d858f7c9fc514f1d9d3be7d00b2dd4e2f2383b55 git Not specified
CNA Linux Linux affected 58729c04cf1092b87aeef0bf0998c9e2e4771133 aca1f2d5de17e138bc6c4859126b77e516b82541 git Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/aca1f2d5de17e138bc6c4859126b77e516b82541 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d858f7c9fc514f1d9d3be7d00b2dd4e2f2383b55 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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